Re: Pointers and LR

Thanks. That's what I thought.

I have already coded the first solution (return without LR on) so i am going to 
leave it that way.

Albert

----- Original Message -----
From: "Ken Sims" <mdrg5003@xxxxxxxxxxx>
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: Pointers and LR
Date: Thu, 20 Jul 2006 13:34:28 -0700


Hi Albert -

I have a program which returns a pointer to a string. It 
currently setons on LR before returning. I use the pointer in 
subsequent programs and everything seems to work okay. However, 
will that memory location eventually be re-used, since I set on 
LR?

If the caller owns the storage you're okay.

If the called program owns the storage directly (i.e. by a definition in
the program rather than allocated storage as described below), this
situation is an accident looking for a place to happen.

I would try to have the caller own the storage.  If that's not possible,
have the called program return with LR off.  When the caller is done with
the storage, call the program with no parameters.  Have the called program
set on LR and return if the number of parameters passed is zero.

Another option is for the called program to ALLOC the storage and make sure
that the ALLOC pointer is passed back.  The caller can deallocate the
storage later.  Both programs must reside in the same activation group.

Ken
http://www.kensims.net/
Opinions expressed are my own and do not necessarily represent the views
of my employer or anyone in their right mind.

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